If you buy Shadowkeep the season of undying is included. But if you want all the next seasons and next activities you'll need to buy Shadowkeep deluxe edition
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whats black armoury? is it relevant? and are the seasons the annual pass?
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You need the anual pass thats linked with shadowkeep. I thing that If you buy forsaken you'll receive black armory and all the other dlcs from year 2.